Per [~coleenp]: We should make this a leaf mutex rather than ttyLocker (which does get broken to allow safepoints!) with no_safepoint_check assuming that the printing doesn't safepoint.

https://github.com/openjdk/jdk/blob/df81b3c66a3b17fc5d10098ce879416affbddd40/src/hotspot/share/interpreter/bytecodeTracer.cpp#L178-L190

    ttyLocker ttyl; // 5065316: keep the following output coherent
    // The ttyLocker also prevents races between two threads
    // trying to use the single instance of BytecodePrinter.
    // Using the ttyLocker prevents the system from coming to
    // a safepoint within this code, which is sensitive to Method*
    // movement.
    //
    // There used to be a leaf mutex here, but the ttyLocker will
    // work just as well, as long as the printing operations never block.
    //
    // We put the locker on the static trace method, not the
    // virtual one, because the clients of this module go through
    // the static method.